Additive Persistence

K - 29 Chars

Input is a filename passed as an argument, 29 chars not including filename.

`0:{5:x,-1+#(+/10_vs)\x}'.:'0:"file"

• 35 -> 31: Remove outside function.
• 31 -> 29: Remove parens.

Python 84 Chars

while 1:
 m=n=int(raw_input());c=0
 while n>9:c+=1;n=sum(map(int,str(n)))
 print m,c

Python (93 bytes)

f=lambda n,c:n>9and f(sum(map(int,str(n))),c+1)or c
while 1:n=int(raw_input());print n,f(n,0)